(57) A molding of modified polyphenylene oxide resin comprises a composite of modified
polyphenylene oxide containing polyphenylene oxide having structure expressed in the
following general formula (I) as a basic skeleton, which resin composite preferably
contains a cross linking agent, more preferably phosphoric ester serving as a cross
linking agent, while the molding is cross-linked by irradiation to ionizing radiation:
 where R₁, R₂, R₃ and R₄ represents univalent substituents selected from a group of
hydrogen, alkyl group, halogen, alkoxyl group and haloalkoxyl group, and n represents a natural number.
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